Giants Trade Luis Arraez to Phillies Hours Before Deadline, Reshuffling Philadelphia's Infield

The San Francisco Giants' fire sale hit its biggest target Monday morning, roughly eight hours before the 6 p.m. ET trade deadline, when they sent second baseman Luis Arraez and reliever Caleb Kilian to the Philadelphia Phillies, according to ESPN's Jeff Passan.

In return, the Giants got the Phillies' No. 4 prospect, right-hander Ramon Marquez, and reliever Marty Gair, according to USA Today's Bob Nightengale.

San Francisco sits 12 games out of a Wild Card spot, according to MLB Trade Rumors, and had nothing left to play for but future value. Arraez, a rental on a one-year, $12 million deal, was the obvious centerpiece.

Why Arraez Was the Prize of the Deadline

Arraez is hitting .324 with an .810 OPS this season, his best numbers since his 2023 Silver Slugger year with the Miami Marlins, according to Sportsnet. He ranks second in the majors in hits with 136 and second in batting average, trailing only Houston's Yordan Alvarez, per MLB Trade Rumors.

What made him the top target on the market wasn't just the bat. Arraez has run a 4.5% strikeout rate this season, the best mark among qualified hitters, while walking just 5.4% of the time. That's the classic Arraez profile: put the bat on the ball, don't miss, don't walk much either.

The surprise has been his glove. Arraez has long carried a reputation as a defensive liability, bad enough that the Giants mostly used him at first base and DH the past two seasons, according to the New York Post. This year, back at second base full time, he's posted a plus-8 fielding run value, the best of his career and a complete reversal from every prior season Statcast has tracked, per Sportsnet.

MLB Trade Rumors reported at least seven teams pursued Arraez, including three AL East clubs and the Padres, where he played earlier in his career. The Giants ultimately chose Philadelphia's offer.

What San Francisco Got Back

Marquez, 20, signed with the Phillies as an international free agent out of Mexico for just $10,000 in 2025 and has since climbed the prospect rankings fast, posting a 1.68 ERA between Single-A and High-A this season, according to the New York Post.

Gair, 23, is a reliever exclusively since being drafted out of Florida Southwestern State JC in 2023. He's posted a 4.50 ERA with six saves in 30 appearances at Single-A this year.

Neither player was on Philadelphia's 40-man roster, which pushes San Francisco's roster to 38 players following the trade, MLB Trade Rumors noted.

Kilian, 29, had been the closest thing to a formally named closer in Giants manager Bob Melvin's bullpen, earning that title June 12 before the team drifted back to a committee approach. He finished with eight saves in 11 chances and a 4.26 ERA in 23 appearances. The Giants traded Kilian in 2021 as part of the Kris Bryant deal.

A Missed Extension, and What Comes Next in Philadelphia

There was reportedly mutual interest in a longer-term deal. Arraez expressed interest in staying, and the Giants had talks, but formal extension negotiations never got off the ground, according to MLB Trade Rumors. Instead, San Francisco cashed in while it could.

For Philadelphia, adding Arraez means solving an infield logjam. Bryce Harper reportedly brought his outfielder's glove on the team's last road trip, signaling he was ready to shift positions if needed, according to MLB.com's Todd Zolecki as relayed by Sportsnet. The expected shuffle: Harper moves to the outfield, Alec Bohm slides to first base, and Bryson Stott moves to third to open second base for Arraez.

That's a lot of moving parts for a contending team to sort out with two months left in the season. Whether that defensive shuffle costs Philadelphia more than Arraez's bat and glove add remains to be seen.

For the Giants, the return is modest: two players who weren't even on Philadelphia's 40-man roster. President of baseball operations Buster Posey's Arraez signing looks like one of his better decisions this year, even as the rest of his roster overhaul largely hasn't panned out, the New York Post noted. Second baseman Casey Schmitt, who might have filled in at the position, tore his left meniscus and is expected to miss the rest of the season, closing off any in-house alternative and forcing Posey's hand.